People talk on Twitter, they crack jokes, they share pictures, and they even try to sell things. Just as users used to have to link out to images before the service started offering that service natively, users will soon be able to make purchases without having to hop out to another site. Twitter is currently testing a feature that will embed a buy button directly into tweets.

When a user decides they want to buy something, Twitter will prompt them for their shipping and payment information.

Point-of-sale systems are about as dull as computers can get. With the ability to figure out sums and print out receipts, they're little more than the digivolved versions of calculators (and not the cool, graphing kind either). This drab sector of the tech industry could benefit from something interesting, so Casio is doing its part by announcing upgraded versions of its Android-powered cash register.

The new V-R7000 and V-R7100 terminals improve on the old where it matters.

When a product on Amazon says it takes two days to arrives, Sunday typically doesn't count. Hey, that's no jab against the company, as this is standard practice in the shipping industry. But now Amazon is expanding Sunday delivery to fifteen cities, giving millions of customers the chance to see this new delivery date show up at checkout.

The lucky metropolitan areas are as follows:

Indianapolis, IN

Lexington, KY

Louisville, KY

New Orleans, LA

Shreveport, LA

Cincinnati, OH

Columbus, OH

Oklahoma City, OK

Philadelphia, PA

Austin, TX

College Station, TX

Dallas, TX

Houston, TX

San Antonio, TX

Waco, TX

The cities are concentrated in only a handful of states, with six of them situated in Texas alone.

Square, the service that makes "commerce easy for everyone," has just expanded its mobile payment/commerce service to Canada.

For those unaware, Square is an app/accessory that allows you to accept credit card payments anywhere from Android or iOS devices. The company provides a free card reader and app in exchange for a small percentage of each completed transaction, giving small and independent businesses an easy, inexpensive, and secure way to open up their products to those paying with plastic.